FD8-36 Equivalent & Substitute Parts Reference

Part Overview

The FD8-36 is a laminated core power transformer manufactured by Triad Magnetics, rated at 100VA with dual primary windings (115V/230V) and a single 36V secondary winding with center tap. This chassis mount transformer is designed for applications requiring isolated AC power conversion with flexible input voltage selection. The part is currently active in production with 663 units in stock. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance are maintained across alternative manufacturers.

Key Parameters

Parameter	Specification
Power Rating	100VA (Max)
Primary Voltage	115V, 230V (Dual)
Secondary Voltage	36V (Full Load)
Secondary Current	2.8A (Max)
Core Type	Laminated
Center Tap	Yes
Mounting Type	Chassis Mount
Termination Style	Solder, Quick Connect - 0.187" (4.7mm)
Isolation Voltage	2500VAC
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the FD8-36 is based on strict equivalence of the following critical parameters:

Electrical Equivalence Criteria:

Power rating: 100VA
Primary winding configuration: Dual (115V/230V)
Secondary voltage: 36V
Secondary current capacity: 2.8A minimum
Center tap presence: Required
Isolation voltage: 2500VAC minimum

Mechanical Equivalence Criteria:

Mounting type: Chassis Mount
Termination style: Solder and Quick Connect compatible
Physical dimensions: Within tolerance for board-level integration
Weight: Equivalent (approximately 2.8 lbs / 1.3 kg)

Regulatory Equivalence Criteria:

RoHS3 Compliance
REACH Unaffected status
ECCN classification: EAR99
HTSUS code: 8504.31.4065

The DP-241-8-36 from Signal Transformer meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Parameter	FD8-36 (Triad Magnetics)	DP-241-8-36 (Signal Transformer)	Match Status
Power Rating	100VA	100VA	Equivalent
Primary Voltage	115V, 230V	115V, 230V	Equivalent
Secondary Voltage	36V	36V	Equivalent
Secondary Current (Max)	2.8A	2.8A	Equivalent
Primary Winding(s)	Dual	Dual	Equivalent
Secondary Winding(s)	Single	Single	Equivalent
Center Tap	Yes	Yes	Equivalent
Core Type	Laminated	Laminated	Equivalent
Mounting Type	Chassis Mount	Chassis Mount	Equivalent
Termination Style	Solder, Quick Connect - 0.187"	Solder, Quick Connect	Equivalent
Isolation Voltage	2500VAC	2500Vrms	Equivalent
Length (mm)	102.39	102.40	Equivalent
Width (mm)	57.15	58.50	Equivalent
Height - Seated (Max) (mm)	65.07	67.70	Equivalent
Weight	2.8 lbs (1.3 kg)	2.8 lbs (1.3 kg)	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
ECCN	EAR99	EAR99	Equivalent
HTSUS	8504.31.4065	8504.31.4065	Equivalent

Engineering Selection Recommendations

FD8-36 (Triad Magnetics): Select this part when existing inventory is available and supply chain continuity with the original manufacturer is prioritized. The FD8-36 is active in production with 663 units currently in stock. ROHS3 compliance and REACH unaffected status confirm regulatory alignment for current applications.

DP-241-8-36 (Signal Transformer): Select this part as a direct substitute when supply constraints on the FD8-36 occur or when procurement from Signal Transformer offers logistics advantages. The DP-241-8-36 maintains identical electrical specifications and regulatory certifications. Current inventory of 899 units provides alternative sourcing. Physical dimensions are within acceptable tolerance for chassis mount applications.

Both parts are classified as Active products with equivalent compliance profiles (ROHS3, REACH Unaffected, EAR99 ECCN classification). Selection between these parts is based on availability, lead time, and procurement preference rather than technical performance differences.

Frequently Asked Questions (FAQ)

Q: Can the DP-241-8-36 be used as a direct replacement for the FD8-36 in existing designs?

A: Yes. The DP-241-8-36 is electrically and mechanically equivalent. Both transformers provide 100VA power, dual 115V/230V primary windings, 36V secondary output at 2.8A maximum current, center tap configuration, and 2500VAC isolation. Chassis mount termination styles are compatible. Physical dimensions are within tolerance for standard PCB and chassis integration.

Q: Are there any dimensional differences that affect board layout?

A: Minor dimensional variations exist. The DP-241-8-36 has a width of 58.50mm compared to the FD8-36 at 57.15mm (1.35mm difference) and a maximum seated height of 67.70mm versus 65.07mm (2.63mm difference). These differences are within standard mechanical tolerances for chassis mount transformers and do not require design modifications for typical applications.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the FD8-36 and DP-241-8-36 are ROHS3 compliant, REACH unaffected, classified as EAR99 for export control, and share the same HTSUS code (8504.31.4065). Regulatory compliance is equivalent across both parts.

Q: What is the significance of the center tap in these transformers?

A: The center tap on the secondary winding allows the 36V output to be configured as either a single 36V supply or split into two 18V supplies with a common center reference. This provides design flexibility for applications requiring dual-rail power supplies or specific voltage configurations.

Q: How do I determine which substitute part to order?

A: Selection is based on availability and procurement logistics. Check current inventory levels: FD8-36 has 663 units in stock, while DP-241-8-36 has 899 units available. Both parts are active in production. Choose based on lead time, supplier relationship, and cost considerations. Electrical and mechanical performance are identical.

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